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NZ construction working-day calculator

For planners, schedulers and contract administrators. Add working days to a date, or count the working days between two dates, as the Construction Contracts Act 2002 defines them, with the right Christmas period for the section you're working to.

Runs on your device. Information, not legal advice.Nothing you type is sent anywhere or stored, and there are no cookies. A contract can define its own working days: if yours does, its definition is the one to use for its own periods.
What do you want to do?
For a claim, the day it was served. The start day itself isn't counted.

Enter a start date.

For a whole claim's chain of dates, with exports for P6, MS Project and your calendar, use the deadline checker.

How the Act defines a working day

Section 5: a working day is any day of the week other than these.

Where the rules come from (checked 1 Nov 2026)

  • Construction Contracts Act 2002, s5, "working day", paragraphs (a), (ab), (b), (c) and (d), read word for word on legislation.govt.nz (version as at 5 October 2023, the latest).
  • Matariki dates: Te Kāhui o Matariki Public Holiday Act 2022, Schedule 1. Anniversary days: Employment New Zealand, "Public holidays and anniversary dates". Dates from 2025 to 2035.